Is there some sort of limition on this method?

I think you are referring to "cash for keys," be it through a formal rent control method,  or through ad hoc agreements with the tenants (cash and free rent for "x" period of time, etc..).

I'm stuck in the mindset that maybe Park City or Garden City would work for AirBnB properties, but is it a method that works elsewhere?

For example, I can get 30 year fixed for 30 year financing for 10% down and decent interest rate (less than 6%) which would give much more security and better cash flow.

I don't have the capital myself and would only consider creative methods for my own BRRRR or similar project down the road. 

Yeah if you look at all the liar loans that were created during the last bubble and selling off the bad loans as mortgaged backed securities .

My questions are: Do I have to give my social security number to get them turned on?

The other tenant has been there years and will be evicted for numerous reasons that the previous owner did not care to address.I plan to fix up the property over the next few months and renew the existing tenant to a higher, 1-year lease and then search for a new tenant at market rate.Feeling a bit overwhelmed, I'd like some advice on where to start with a new thorough lease and forms to use since I want to secure a new lease with the existing tenant and will need to screen for a new tenant once I evict and renovate the other unit.I am considering to join the California Apart.

I'm interested in long term opportunities for cashflow and would like to attempt to aquire a few cashflow opportunities utilizing the BRRRR method. 

Knowing my timeline, do you think it's feasible (and wise) to start by going hard-core into wholesaling, then build up into fix & flips (for fast profit), and then rolling all of that income into buy and holds with the BRRRR method?